Make the blue liquid: Brew the dried butterfly pea flower with off-the-boil water for about 10 mins. Squeeze out as much color as possible by hand, strain out the liquid, and discard the pea flower.
Mix the rice and the blue liquid: Wash, rinse, and drain the jasmine rice well, and transfer it into a medium-sized pot. Pour in the blue liquid. Cover the pot with a lid. Turn on the stove to high heat and bring it to a boil.
Let it steam: Once boiling, lower the heat to medium-low. Let the pot steam until all the water has evaporated, about 10 - 15 mins. The blue rice that remains should be fluffy and ready to serve.
Alternatively, use a rice cooker.